One or more techniques and/or systems are disclosed for providing a client application with access to a file based upon a local offline version of the file and/or web online version of the file. That is, a file may be shared/synchronized from a remote source, such as a web storage service. A web online version of the file may be maintained by the web storage service, while local offline versions of the file may be stored at client devices. A sync module comprising knowledge of the local and/or web versions of the file may provide a client application with access to the file based upon the local and/or web version of the file. The sync module may also delegate synchronization authorization to the client application given that the client application may comprise sophisticated file handling functionality.